You don't need it, but it certainly helps you know what your environment is so you can upgrade/patch one piece at a time without affecting everything. Need a ne

You don't need it, but it certainly helps you know what your environment is so you can upgrade/patch one piece at a time without affecting everything. Need a new libc for your database? Feel free to upgrade it without worrying if your webserver or plugins will break. Also, you can more exactly replicate your production environment on your local development machine or replace production if the machine dies. I love docker for anything where I'm not going to be running whatever is in the repository of whatever Linux distribution I'm running.